Which of the following defines a confined space?

A confined space is specifically characterized by being not designed for continuous occupancy. This means that the space may occasionally be occupied by personnel but is not meant for prolonged stays or regular work activities. Such spaces typically have limited entry and exit points, which can pose safety hazards, as they may not provide adequate ventilation or emergency access.

This definition is critical in various industries, particularly in tankering and shipping, where workers might need to perform tasks in areas such as cargo tanks, bilges, or other enclosed environments. Understanding that a confined space is not intended for continuous occupancy helps emphasize the need for precautions and specific safety measures when entering and working in these areas.

The other options describe characteristics that would not align with the definition of confined spaces — for example, spaces meant for regular occupancy or those with ample means of entry and exit tend to be safe and suitable for prolonged use, which contradicts the concept of a confined space.